Before Programming a Control Module

NOTE: DO NOT program an existing control module with the identical software/calibration package. This procedure is not a short cut to correct a driveability condition. This is an ineffective repair. A control module should only be programmed when General Motors Corporation releases an updated software/calibration package or when a service procedure instructs you to replace the control module or service part control module does not contain operating software or calibrations.

Ensure that the following conditions are met before programming a control module: Vehicle system voltage. Ensure there are no charging system concerns. All charging system concerns must be repaired before programming a control module. Ensure battery voltage is greater than 12 volts but less than 16 volts. The battery must be fully charged before programming the control module. A battery charger can not be connected to the vehicles battery during programming. Incorrect system voltage or voltage fluctuations from a battery charger may cause programming failure or control module damage. Turn off or disable any system that may put a load on the vehicles battery. Applying parking brake. Disable the DRL system, heating, ventilation, and air conditioning (HVAC) systems, Engine cooling fans. Ensure ignition switch is in the proper position. The scan tool prompts you to turn the ignition on, with engine off. Do not change position of ignition switch during the programming procedure unless instructed to do so. Ensure following tool connections are secure: The RS-232 cable, DLC connection, voltage supply circuits and OBPA. Do not disturb the tool harnesses while programming. If an interruption occurs during the programming procedure, programming failure or control module damage may occur. If you are performing the pass-through programming procedure using a notebook computer without the power cord, ensure that the internal battery is fully charged.